Saint on the battlefield -I was married to the Duke Knight instead of my sister, but I'm happy now ~ (Volume 1 is the latest issue)

Publisher: Kodansha
Author: Suzawa Dyei, Reichi Sujo, Seven
Size: 128mm x 182mm
Number of books: 1
Language: Japanese
Category: Female manga, manga
Latest release date: 2024-01-30

Synopsis:
Unlike a saint's sister, a saint, Fine, a sober Fine, was treated too unfortunate in his parents' house.
When she is sent to a dangerous battlefield and working as a military physician, she meets Leon, the Duke.
If you help him dying with healing magic, you will be applied for a marriage later!
I suspect that I am mistaken for my sister, but in the Duke's family, I will have a different happy life ...!?!?!?